Каталог Stellram токарный инструмент - страница 200

Maximum Depth of Cut & Chip Thickness

When deciding on the maximum depth of cut (a ) for a given insert, the angle of the principal edge plays

a significant role in the type of the chip formed. For an angle close to 90°, the thickness of the chip will be p

equal to the feed. In the other cases, it will be necessary to calculate it.

h = f h = f sin [k ] h = 2f [(a /2R). (1-a /2R)]

r p p

k = 90° k < 90° k = cos-1. [1-a /R]

r r r p

The type of insert used plays a significant role in the rigidity of the cutting edge. A cutting

edge angle of kr 75° or 45° allows for difficult machining operations, i.e. interrupted and heavy

roughing, but reduces the capacity to machine profiles. The most robust insert shape is round

and the most fragile standard insert is the 35°diamond (V).

The size and type of insert determines the maximum depth of cut. In general, it is advisable

to select a cutting edge length in relation to the maximum depth of cut to be machined.

Cutting Edge Length for a given depth of cut (a ) and k angle

p r